W83877 Winbond Electronics Corp America, W83877 Datasheet - Page 9

• Manufacturer Part Number: W83877
• Description: Winbond I/O
• Manufacturer: Winbond Electronics Corp America

1.4 Multi-Mode Parallel Port
The following pins have eight functions, which are controlled by bits PRTMOD0, PRTMOD1, and
PRTMOD2 of CR0 and CR9 (refer to section 8.0, Extended Functions).
BUSY
ACK
SYMBOL
PIN
24
26
OD
OD
OD
OD
I/O
IN
IN
IN
IN
_
_
t
12
t
12
t
12
t
12
PRINTER MODE: BUSY
An active high input indicates that the printer is not ready to
receive data. This pin is pulled high internally. Refer to the
description of the parallel port for the definition of this pin in ECP
and EPP mode.
EXTENSION FDD MODE: MOB2
This pin is for Extension FDD B; the function of this pin is the
same as that of the MOB pin.
EXTENSION ADAPTER MODE: XIRQ
This pin is an interrupt request generated by the Extension
Adapter and is an active high input.
EXTENSION 2FDD MODE: MOB2
This pin is for Extension FDD A and B; the function of this pin is
the same as that of the MOB pin.
JOYSTICK MODE: NC pin.
PRINTER MODE: ACK
An active low input on this pin indicates that the printer has
received data and is ready to accept more data. This pin is
pulled high internally. Refer to the description of the parallel port
for the definition of this pin in ECP and EPP mode.
EXTENSION FDD MODE: DSB2
This pin is for the Extension FDD B; its functions are the same
as those of the DSB pin.
EXTENSION ADAPTER MODE: XDRQ
DMA request generated by the Extension Adapter. An active
high input.
EXTENSION 2FDD MODE: DSB2
This pin is for Extension FDD A and B; this function of this pin is
the same as that of the DSB pin.
JOYSTICK MODE: NC pin.
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FUNCTION
Publication Release Date: January 1996
W83877F
Revision A2